Picked a mole off of my arm, now scared!

please see your physician and start silicone based scar gels with growth factors at this time. Best, Dr. Emer.

The lesion is likely benign and could be a keratosis, which is a benign thickening of the outer layer of the skin. It is not likely of any concern unless it doesn't heal after a few weeks or grows and becomes darker. To help it heal, just Vaseline and a bandage is needed.